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Mortgages Payable - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Mortgage Loans on Real Estate    
Net carrying value of real estate collateralizing the debt $ 629,134  
Mortgages payable, net of deferred debt issuance costs 1,089,613 $ 1,156,170
Mortgages    
Mortgage Loans on Real Estate    
Mortgages payable, net of deferred debt issuance costs $ 1,089,613 $ 1,156,170
731 Lexington Avenue | Office space | Mortgages    
Mortgage Loans on Real Estate    
Debt instrument, description of variable rate basis LIBOR  
Interest rate 0.0101%  
731 Lexington Avenue | Office space | Mortgages | LIBOR    
Mortgage Loans on Real Estate    
Basis spread over LIBOR 0.90%  
731 Lexington Avenue | Retail space | Mortgages    
Mortgage Loans on Real Estate    
Interest rate 0.0172%  
731 Lexington Avenue | Retail space | Mortgages | Interest rate swap    
Mortgage Loans on Real Estate    
Debt instrument, description of variable rate basis LIBOR  
Interest rate 1.72%  
731 Lexington Avenue | Retail space | Mortgages | LIBOR | Interest rate swap    
Mortgage Loans on Real Estate    
Basis spread over LIBOR 1.40%  
Rego Park II | Retail space | Mortgages    
Mortgage Loans on Real Estate    
Debt instrument, description of variable rate basis LIBOR  
Interest rate 0.0145%  
Rego Park II | Retail space | Mortgages | LIBOR    
Mortgage Loans on Real Estate    
Basis spread over LIBOR 1.35%